Pre-Algebra Examples

$21 + (- 21) + (- 4)$

Step 1

Remove parentheses.

$21 - 21 - 4$

Step 2

Subtract $21$ from $21$ .

$0 - 4$

Step 3

Subtract $4$ from $0$ .

$- 4$

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$